To get this image data into a file requires some passing through other classes. However, this is possible in Python on macOS. (I had some trouble, but figured it out with some help in the MacAdmins Slack #python channel, thanks!)These are the posts that were recommended reading or watching:

In case you need an image file for the Mac, here is the code. It will generate a 512px image for the current Mac. The two lines you may want to change are line 7 for the size of the image and line 16 for the filename.